CVE-2021-20333

Name: CVE-2021-20333
Creator: NVD / NIST
Published: 2021-07-23T12:15:08.453+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.27%

Last modified Jun 17, 2026

CVE-2021-20333 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Sending specially crafted commands to a MongoDB Server may result in artificial log entries being generated or for log entries to be split. This issue affects MongoDB Server v3.6 versions prior to 3.6.20; MongoDB Server v4.0 versions prior to 4.0.21 and MongoDB Server v4.2 versions prior to 4.2.10.. EPSS estimates a 1.27% chance of exploitation in the next 30 days.

Description

Sending specially crafted commands to a MongoDB Server may result in artificial log entries being generated or for log entries to be split. This issue affects MongoDB Server v3.6 versions prior to 3.6.20; MongoDB Server v4.0 versions prior to 4.0.21 and MongoDB Server v4.2 versions prior to 4.2.10.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

1.27%

66.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mongodb	Mongodb	>= 3.6.0, < 3.6.20
Mongodb	Mongodb	>= 4.0.0, < 4.0.21
Mongodb	Mongodb	>= 4.2.0, < 4.2.10

References

https://jira.mongodb.org/browse/SERVER-50605Exploit, Patch, Vendor Advisory
https://jira.mongodb.org/browse/SERVER-50605Exploit, Patch, Vendor Advisory

Timeline

Published: Jul 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20333?

How severe is CVE-2021-20333?

CVE-2021-20333 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.27% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20333?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20333?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST